01The trap1/12

A credit card is not free money and it is not a trap. It is a loan with a deadline.

Every purchase on a credit card is money borrowed from the card issuer. Repay the full statement balance by the due date and the loan is free. Leave any of it unpaid and interest starts on the remainder — often around 20% a year, charged monthly. That one rule explains almost everything about credit.

Pay in full by the due date: no interest, ever.
Pay the minimum: interest on the rest, every month, until it is gone.
The card does not care which you choose — the cost difference is entirely yours.

02The statement2/12

One page decides what a card costs you

A student-card statement. Tap each line to see what it controls.

Student card · statementFeb 1 – Feb 21

Statement balance

$612.40

This is the number to pay. Pay exactly this by the due date and the borrowing costs you nothing.

Tap any line on the statement.

03Predict3/12

Before the maths — guess

A $600 laptop on a card at 19.99% APR, paying only the minimum each month. How long until it is paid off?

Pick one — guessing first is the point.

04The real cost4/12

Same purchase, three ways to pay it

Move the sliders. The price never changes — only the interest you volunteer to pay.

Purchase amount$600.00

APR19.99%

Your monthly payment$100.00

Interest is charged only on what is still owed after the due date. Nothing else about the purchase changes.

Paid in full by the due date$0 interest

Paying $100.00 a month$37.59 interest · 7 months

Minimum payment only$490.09 interest · 93 months

Total paid $1,090.09 for a $600.00 purchase.

05Quick check5/12

Quick check

Answering every check in this lesson completes it automatically.

Knowledge check

What are you actually doing when you pay with credit?

Spending money you already holdBorrowing money you have agreed to repayReceiving a discount from the bankInvesting on the store's behalf

06Grace period6/12

The 21 days that make it free

Choose what you do on the due date and watch what it costs.

Feb 1 · cycle startsFeb 21 · statementMar 14 · due

Statement balance paid on Mar 14

$0.00 in interest

The grace period held. Borrowing $612 for three weeks cost nothing.

07The vocabulary7/12

The five words on every statement

Tap each one — these decide what a card costs you.

08Real situation8/12

Jonah's $600 laptop

Jonah is 18 with a student card at 19.99% APR and a $1,000 limit. He buys a $600 laptop for school. The statement shows a $18 minimum and a due date in 23 days. He has $250 now and gets paid in two weeks.

09Check again9/12

Check your understanding

Answering every check in this lesson completes it automatically.

Knowledge check

You pay only the minimum on a credit balance each month. What generally happens?

The balance clears fasterInterest stops being chargedThe balance shrinks slowly while interest keeps being chargedThe lender cancels the remaining amount

10Building credit10/12

What a card actually builds

Used carefully, a credit card creates a record that you borrow and repay on time. That record follows you into renting an apartment, financing a car or getting a phone plan. The behaviour that builds it is unglamorous: small purchases you were going to make anyway, paid in full, on time.

On-time payment history is the single biggest factor in a credit score.
Carrying a balance does not build credit faster — it only costs more.
Applying for many cards at once works against you.

11Last check11/12

One more

Answering every check in this lesson completes it automatically.

Knowledge check

Why does a credit history matter later in life?

It decides how much income tax you payLenders, and sometimes landlords, use it when deciding whether to approve youIt sets the interest rate on your savings accountIt is required to open a first bank account

12Takeaway12/12

The one thing to remember

Pay the statement balance in full, on time. That single habit makes credit free and builds your record.

Your progress

0 of 3 checks answered

Up next · Lesson 10 of 15Understand Your First Paycheque

Sources

Last reviewed July 23, 2026

Educational content only. ProfitED provides general educational information and does not provide personalized tax, legal or financial advice. Rules may change and may differ based on your province, territory and circumstances. Verify important decisions with the Canada Revenue Agency, another appropriate government source or a qualified professional.